Thanks for reply. The macro uses parmbuff option. &syspbuff is something like: (input_data, output_data, event_indicator, input_var) among the parameters, the input_var itself is a list of variables separated by ",". That line of code sequentially takes these parameters one by one. so the %scan function should use delimiters including , and left and right parentheses. I cannot figure out why the delimiter portion is written that way.
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